Cough (more than usual if chronic) including croup (barking cough, making a whistling noise when breathing) Not related to other known causes or conditions (e.g. asthma, reactive airway).
Shortness of breath (dyspnea, out of breath, unable to breathe deeply, wheeze, that is worse than usual if chronically short of breath) Not related to other known causes or conditions (e.g. asthma)
Decrease or loss of smell or taste (new olfactory or taste disorder) Not related to other known causes or conditions (e.g. nasal polyps, allergies, neurological disorders).
Sore throat (painful swallowing or difficulty swallowing)
Stuffy nose and/or runny nose (nasal congestions and/or rhinorrhea) Not related to other known causes or conditions (e.g. seasonal allergies, returning inside from the cold, chronic sinusitis unchanged from baseline, reactive airways).
Headache that is new and persistent, unusual, unexplained, or long-lasting. Not related to other known causes or conditions (e.g. tension-type headaches, chronic migraines).
Nausea, vomiting and/or diarrhea
Fatigue, lethargy, muscle aches or malaise (general feeling of being unwell, lack of energy, extreme tiredness,) that is unusual or unexplained.